linux-kernel - Re: [PATCH v6 04/18] arm64: Add a helper for PARange to physical shift conversion

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Date:   Mon, 1 Oct 2018 13:05:21 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, peter.maydell@...aro.org,
        cdall@...nel.org, kvm@...r.kernel.org, marc.zyngier@....com,
        rkrcmar@...hat.com, will.deacon@....com,
        linux-kernel@...r.kernel.org, dave.martin@....com,
        eric.auger@...hat.com, julien.grall@....com,
        James Morse <james.morse@....com>, pbonzini@...hat.com,
        kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v6 04/18] arm64: Add a helper for PARange to physical
 shift conversion

On Wed, Sep 26, 2018 at 05:32:40PM +0100, Suzuki K. Poulose wrote:
> On arm64, ID_AA64MMFR0_EL1.PARange encodes the maximum Physical
> Address range supported by the CPU. Add a helper to decode this
> to actual physical shift. If we hit an unallocated value, return
> the maximum range supported by the kernel.
> This will be used by KVM to set the VTCR_EL2.T0SZ, as it
> is about to move its place. Having this helper keeps the code
> movement cleaner.
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: James Morse <james.morse@....com>
> Cc: Christoffer Dall <cdall@...nel.org>
> Reviewed-by: Eric Auger <eric.auger@...hat.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>

Acked-by: Catalin Marinas <catalin.marinas@....com>